This is an excellent (and brief) interview with Shirley Glass, she's an infidelity researcher... (died in 2004). She's researched infidelity for over twenty years... twenty years hard data crunched by this woman...

http://www.smartmarriages.com/glass.html

This is the first piece I read of hers, after i read this I had to read the whole book... She has only published the one book Not Just Friends

I believe she has a DVD available with a workshop as well...

It's great info to protect yoru marriage from infidelity... Don't think people who don't have infidleity in their home shouldn't read this text.. EVERY couple wanting to protect their marriage and keep it safe from third party violation need to read her book...